Novel hybrid silicone resin composites with excellent low dielectric and high temperature mechanical properties

With the development of aerospace technology, the temperature resistance of traditional silicone resins fails to satisfy the ever-increasing demand from the stringent application conditions. In this paper, we used diphenyl sulfide (TBSP), diphenyl sulfoxide (SIBSP), and diphenyl sulfone (SODP) to modify the main chain of SiR by hydrolysis-condensation and prepared the quartz fiber reinforced SiR composites. The mechanical properties of QF@SiR composites were measured, and the effects of temperature on the mechanical properties were investi-gated. Compared with QF/SiR, the ILSS and bending strength of QF/SiR@SODP composites enhanced from 15.58 MPa to 183.59 MPa-25.36 MPa and 338.37 MPa at room temperature. Moreover, at 500 ?, the ILSS and bending strength of QF/SiR@SODP were 11.87 MPa and 114.37 MPa, representing an enhancement of 514% and 315% compared with SiR composite. The structural, heat resistance and composition changes of the composites were determined by SEM, TG and IR, and the failure mechanism of the composites at high temperature was elucidated.

Automated summary

In this study, diphenyl sulfide, diphenyl sulfoxide, and diphenyl sulfone were used to modify the main chain of traditional silicone resins. The quartz fiber-reinforced silicone resin composites were prepared and their mechanical properties were measured. It was found that the modified composites exhibited enhanced shear strength and bending strength at high temperatures.